diff options
Diffstat (limited to 'intern/cycles/kernel/kernel_curve.h')
| -rw-r--r-- | intern/cycles/kernel/kernel_curve.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/intern/cycles/kernel/kernel_curve.h b/intern/cycles/kernel/kernel_curve.h new file mode 100644 index 00000000000..e065717888c --- /dev/null +++ b/intern/cycles/kernel/kernel_curve.h @@ -0,0 +1,141 @@ +/* + * Copyright 2011, Blender Foundation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +CCL_NAMESPACE_BEGIN + +#ifdef __HAIR__ + +/* curve attributes */ + +__device float curve_attribute_float(KernelGlobals *kg, const ShaderData *sd, AttributeElement elem, int offset, float *dx, float *dy) +{ + if(elem == ATTR_ELEMENT_CURVE) { +#ifdef __RAY_DIFFERENTIALS__ + if(dx) *dx = 0.0f; + if(dy) *dy = 0.0f; +#endif + + return kernel_tex_fetch(__attributes_float, offset + sd->prim); + } + else if(elem == ATTR_ELEMENT_CURVE_KEY) { + float4 curvedata = kernel_tex_fetch(__curves, sd->prim); + int k0 = __float_as_int(curvedata.x) + sd->segment; + int k1 = k0 + 1; + + float f0 = kernel_tex_fetch(__attributes_float, offset + k0); + float f1 = kernel_tex_fetch(__attributes_float, offset + k1); + +#ifdef __RAY_DIFFERENTIALS__ + if(dx) *dx = sd->du.dx*(f1 - f0); + if(dy) *dy = 0.0f; +#endif + + return (1.0f - sd->u)*f0 + sd->u*f1; + } + else { +#ifdef __RAY_DIFFERENTIALS__ + if(dx) *dx = 0.0f; + if(dy) *dy = 0.0f; +#endif + + return 0.0f; + } +} + +__device float3 curve_attribute_float3(KernelGlobals *kg, const ShaderData *sd, AttributeElement elem, int offset, float3 *dx, float3 *dy) +{ + if(elem == ATTR_ELEMENT_CURVE) { + /* idea: we can't derive any useful differentials here, but for tiled + * mipmap image caching it would be useful to avoid reading the highest + * detail level always. maybe a derivative based on the hair density + * could be computed somehow? */ +#ifdef __RAY_DIFFERENTIALS__ + if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f); + if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f); +#endif + + return float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + sd->prim)); + } + else if(elem == ATTR_ELEMENT_CURVE_KEY) { + float4 curvedata = kernel_tex_fetch(__curves, sd->prim); + int k0 = __float_as_int(curvedata.x) + sd->segment; + int k1 = k0 + 1; + + float3 f0 = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + k0)); + float3 f1 = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + k1)); + +#ifdef __RAY_DIFFERENTIALS__ + if(dx) *dx = sd->du.dx*(f1 - f0); + if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f); +#endif + + return (1.0f - sd->u)*f0 + sd->u*f1; + } + else { +#ifdef __RAY_DIFFERENTIALS__ + if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f); + if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f); +#endif + + return make_float3(0.0f, 0.0f, 0.0f); + } +} + +/* hair info node functions */ + +__device float curve_thickness(KernelGlobals *kg, ShaderData *sd) +{ + float r = 0.0f; + + if(sd->segment != ~0) { + float4 curvedata = kernel_tex_fetch(__curves, sd->prim); + int k0 = __float_as_int(curvedata.x) + sd->segment; + int k1 = k0 + 1; + + float4 P1 = kernel_tex_fetch(__curve_keys, k0); + float4 P2 = kernel_tex_fetch(__curve_keys, k1); + r = (P2.w - P1.w) * sd->u + P1.w; + } + + return r*2.0f; +} + +__device float3 curve_tangent_normal(KernelGlobals *kg, ShaderData *sd) +{ + float3 tgN = make_float3(0.0f,0.0f,0.0f); + + if(sd->segment != ~0) { + float normalmix = kernel_data.curve_kernel_data.normalmix; + + tgN = -(-sd->I - sd->dPdu * (dot(sd->dPdu,-sd->I) * normalmix / len_squared(sd->dPdu))); + tgN = normalize(tgN); + + /* need to find suitable scaled gd for corrected normal */ +#if 0 + if (kernel_data.curve_kernel_data.use_tangent_normal_correction) + tgN = normalize(tgN - gd * sd->dPdu); +#endif + } + + return tgN; +} + +#endif + +CCL_NAMESPACE_END + |